Belt grinding and polishing device



May 9, 1950 A. N. EMMoNs BELT GRINDING AND POLISHING DEVICE 4 Sheets-Sheet v1 Filed May 25, 1946 May 9, 1950 A.` N, EMMONS BELT GRINDING AND POLISHING DEVICE 4 .Sheets-Sheet 2 Filed May 23, 1946 I N VEN TOR.

May 9, 1950 A, N, EMMONs 2,507,372

BELT GRINDING AND FOLISHING DEVICE Filed May 25, 1946 4 Sheets-Sheet 3 IN V EN TOR.

mnu-X0 May 9, 1950 A. N. EMMoNs BELT GRINDING AND POLISHING DEVICE 4 Sheets-Sheet 4 Filed May 23, 1946 INVENTOR.

Patented May 9, 1950 l aaai-gert Y A v BELT-'GEINDING'AND ifoLIsHvlNGm-EVIC ,smmtgjivedreziu n able Machine compitan syracuse',

This inventionrelates tofabra'sive,beltagrinding apparatus, and more :particularly `toi-a ybackstand structure.

The manufacture;andrrconstruction o f abrasiye belts has advanced to the pointavhere such belts arepresently used for performing -,grinding and polishing operationsthat heretofore weren-pergformed by ,other meansfsuch sas stones, --dressed wheels, and the like.

To a great extent, abrasive belts-are usedvoii machines consisting 1 of an arbor journalled -in the Vmachine and operatively connected to alimotive power, and a backstandconsistingof a suitable :supporting arrangement jon which an idler Apulley vis journalled. VThese `machines `are relatively expensivegthej cost vonf-the samebeingaprof hibitive for small-shops that j occasionally have grinding and bulngoperations whichcanbe conveniently and -economically performed on .such

machines. s l n 5 This invention has asan object, an abrasiye beltv grinding mechanism inthe ,natureof a back; stand embodying a particularly simple structure which is economical to V'manufacture and which retails at a price which is only a fraction of the cost of abrasive belt vgrinding machines, and which may be conveniently mounted upon a work bench, or the like, if; juxtaposition to an ordinary bench grinder, the latter furnishing the motive power for the 'device and serving as the arbonor lower pulley, of thefabrading belt mechanism, the varrangement being -,such thatvgthe 'backstand structure does notgin :any way interfe're ,with Vthe regular and ordinary use ofuthe `bench grinder as such, all'whereby a smallgshop, garage, or the like,.can acquire the backstand structure at a very low cost and which, in conjunction with an ordinary bench grinder, provides an eicient belt grinding mechanism.

The invention further contemplates a device of the type referred to in which a driving pulley is journalled in the base portion of the device to be belt driven by any suitable motor.

The invention consists in the novel features and in the combinations and constructions hereinafterset forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a front, elevational view of the backstand device embodying my invention illustrated in combination with a bench grinder.

Figure 2 is a side elevational View of the backstand device shown in Figure 1.

Figure 5.

rigore 51s neges/arisen viewer the lewe;

.manner a modifie ram if the ,hackear-m de- `Vice.

va bench.` Thegbaseisormed Ywith an upwardly portions I9, or one of them, are vformed with end-'thedisk wrtins are. nrog n iapejiireto ecweabbirzz dieet if@ hrigling alilifh theopvstanding sport-ion l I 3 offtl base, andwhich .serves ,pira-abba 'which o, may .b me@ from reticoli?) hgiaoiitisiion, s indicated in dotted .Outline ai 2.3@ Fiilgs 2 ,and-5; The arg1 is secured-i adjusted position yby cap screwsfZd extending through the regate 'Slots se@ threading into the upwardly extending portion I3 of the base.

The idler pulley I6 is journalled on a shaft 21, see Figure 3. This shaft is carried by a bracket 28 pivotally mounted on a plate 29 which is adjustable lengthwise of the arm |'I-I. The bottom Wall Il of the arm is provided with an elongated slot 30 to receive screws 3| extending through apertures formed in the plate 29 and through the slot 30, and having nuts 32 threaded thereon, whereby the plate 29 is adjustable toward Y and from the base I0. The bracket 28 is pivotally mounted on a pin 33, and the bracket is yieldingly urged in a clockwise direction, Figures 2 and 4, by a helical compression spring 34 interposed between a projection 35 of the bracket and the plate 29, the arrangement being suchl that the idler pulley I6 is urged in a direction away from the base. The bracket 28 is positioned under action of spring 34 by an adjustable stud 36 threaded into a projection 31 of the bracket and engaging a stop 38 mounted in plate 29.

The shaft 21 is mounted in a block 40 arranged in a rectangular slot formed in the forwardly extending portion of the bracket 28, the slot opening downwardly, and the block being pivotally mounted therein on a pin 4I. The shaft 21 is secured in the block 40 as by means of a set screw 42, see Figure 3. The purpose of so pivotally mounting the block and the shaft 21 carried thereby, is to adjust the axis of the pulley I6 in order to make the abrasive belt 44 track properly. This pivotal movement is brought about by manipulating a screw 45 threading through the bottom wall of the slot and engaging the block 40. The bracket 28 is formed with a forwardly extending portion 46 which serves as a handle to conveniently move the idler pulley assembly downwardly toward the base against the action of spring 34 for convenience in changing abrasive belts.

The backstand apparatus is securely mounted on the bench 50 in juxtaposition to a conventional bench grinder 5l so that the upper idler pulley I6 is positioned above and in alinement with a pulley 52 mounted upon the shaft of the bench grinder. This pulley may be of aniy Asuitable structure and if desired, the conventional emery stone used on such grinders can serve as a pulley. If desired, the arm l1--I8 can be swung to horizontal position by loosening the cap screws 24.

In Figures 5 and 6, the base member I9 is formed with a forwardly and upwardly extending portion 54 in which a shaft 55 is journalled and on one end of which a driving pulley 55 may be mounted, and on the opposite end a belt pulley 51 which preferably is formed of hard felt, rubber, canvas, or the like, to present a slightly yielding surface. With this arrangement, the shaft may be belt driven by a motor mounted on the bench to the rear of the base I0. Deburning, polishing, and like grinding operations, may be performed on the contact roll 51, and irregular surfaces may be treated on the belt above the contact roll.

It will be observed that the structure described is particularly simple and economical to manufacture. The channel shaped arm l1-l8 affords a particularly rigid support for the upper idle pulley, and the elongated slot 30, formed in the bottom wall l1 thereof, permits the use of abrasive belts over a wide range of length.

The device, as illustrated in Figures 1 to 4, effectively converts an ordinary bench grinder reversed to position the pulley l5 on the left side of the bracket 28, and the pivot pin 4I is positioned in a hole 59 for this purpose, and

. the adjusting screw 45 transferred to the threaded aperture 59, see Fig-ure 3. Preferably, the upper pulley i5 is partially enclosed by an arcuate guard 60 secured to the bracket 28 as by screws 6l. A platen 52 is positioned intermediate the upper pulley I8 and the lower pulley and arranged to engage the rear side of the forward run of the belt 44. The platen is formed with a rearwardly extending shank 63 provided with an elongated slot 64 to receive a fastening screw 65.

What I claim is:

An abrasive belt grinding and polishing device comprising a base member adapted to be mounted on a bench and having an upwardly extending portion, an arm member of channel formation with the sides thereof terminating in spaced apart disks overlapping said upstanding portion of the base, and means cooperable to secure the arm to said base member, the wall intermediate the sides of said arm being formed with an elongated slot, a plate mounted on the arm, fastening means extending through said slot and being cooperable to secure the plate to the arm, a bracket pivotally mounted upon said plate on an axis extending transversely of the arm, an abrasive belt pulley journalled on the bracket, and means yieldingly urging the bracket about said axis to move said pulley in a direction away from the base.

ARTHUR N. EMMONS.

REFERENCES CITED The following references are of record in the le o this patent:

UNITED STATES PATENTS Number Name Date 681,636 Furher Aug. 27, 1901 '147,699 Gough Dec. 22, 1903 1,153,479 Beugler Sept. 14, 1915 2,098,808 Ocenasek Aug. 10, 1931 2,313,254 Mead Mar. 9, 1943 

